Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fac58f781f496ee…

MALICIOUS

PDF

82.7 KB Created: 2021-07-21 22:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 37bdc447a35843a49ad671639a3c4bc7 SHA-1: 079044d14ff8856a2aa367a1b3f5f590e6afe125 SHA-256: 5fac58f781f496ee6ef544659bf72932fbf774b31e8da813ecb6a9a1c1b52134
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and numerous embedded URLs strongly suggest it's part of a phishing or scam campaign, likely leading to further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc0532e1c7---duroxukugug.pdf In PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/83a8b1a1fbe420751e320916ef1958e3/zubadokiwagawuxadijusejo.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210525224746.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/tosag.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27efb3a85---9451451785.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ab1efdfe70fd2e96ed91f41e66dd559a/75892795377.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d59926cad0a99486e21f02e16ba82d99/65373054528.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/powojibolaf.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/44248970364.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734a65ca74---bovajubub.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3hbga7tlb2a76r3bed1e8v2msk/luvotok.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b323c07c898---18592530195.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/34773510791.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8m8eoh281tnuo48ds52hst9rk5/dukexutovupuzadupoto.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c0b9577e7---gabifu.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/74148766753.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c95ce481c236d0abdb49e685d7028816/dapejulebidanemubuworadu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2560c1fe0---81791256000.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3de3b396---46851241989.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/47240556419.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a4baa346---pesuwupaw.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/9liruskuu6d2mji2p2bgloh1lu/35512115057.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/511259d83084412309be4ae8ed9f615d/zisefunuvovuvujixilisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cover+page+for+a+research+proposalPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 10560 bytes
SHA-256: 6be504e6cbf59a88b7736de6badf2202ddec2dc4668578bb81c986740f7ceaaf
font_01_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 17388 bytes
SHA-256: d239055db19a3c7b14c3da58435bb510bb9e7b05d0cf3427c5e4e0636910798e
font_02_sfnt_off0001239e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1